D4 Insight Senior Product Engineer Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions on CSS and Jquery mainly.

Q1. What is the CSS box model?
Ans. 
The CSS box model is a design and layout concept that defines the structure and sizing of elements on a web page.
• It consists of content, padding, border, and margin around an element.

• Content area is where text and images are displayed.

• Padding is the space between the content and the border.

• Border is the line that goes around the padding and content.

• Margin is the space outside the border.

• Example: div { width: 200px; pad...read more
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Q2. How do you select all div elements using jQuery?
Ans. 
To select all div elements using jQuery, use the selector $('div').
• Use the jQuery selector $('div') to select all div elements on the page.

• You can also use the find() method to select div elements within a specific parent element.

• To perform actions on the selected div elements, use jQuery methods like css(), text(), or addClass().
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Q3. How can you change the background color of all items in JavaScript?
Ans. 
You can change the background color of all items in JavaScript by selecting all elements and setting their background color property.
• Select all elements using document.querySelectorAll()

• Loop through the selected elements and set their style.backgroundColor property

• Example: document.querySelectorAll('.item').forEach(item => item.style.backgroundColor = 'blue');
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Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions on Java mainly.

Q1. What are the uses of the final keyword in Java?
Ans. 
The final keyword in Java is used to define constants, prevent method overriding, and make a class immutable.
• Final variables cannot be reassigned once initialized

• Final methods cannot be overridden in subclasses

• Final classes cannot be extended
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Q2. What is the Front Controller in Spring MVC?
Ans. 
Front Controller in Spring MVC is a design pattern that handles all requests and acts as a central point of control.
• Front Controller is a servlet in Spring MVC that receives all requests and then dispatches them to the appropriate handlers.

• It helps in centralizing request handling logic, improving code organization and reducing duplication.

• Front Controller can perform tasks like authentication, logging, exception handl...read more
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Q3. What is the annotation for request mapping in Java?
Ans. 
The annotation for request mapping in Java is @RequestMapping.
• @RequestMapping annotation is used to map web requests to specific handler methods in Spring MVC.

• It can be applied at class level or method level to specify the URL path that the controller will handle.

• You can also specify HTTP request methods, headers, parameters, and more using @RequestMapping.
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Q4. What is the annotation used for a controller in Java?
Ans. 
The annotation used for a controller in Java is @RestController.
• Used to define a class as a controller in Spring MVC

• Automatically serializes return objects into JSON/XML responses

• Equivalent to @Controller + @ResponseBody annotations
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Round duration - 30 minutes
Round difficulty - Easy

This was a typical HR round.

Q1. Basic QA related Questions
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Round duration - 45 Minutes
Round difficulty - Hard

It was conducted in the evening on Teams call. It was a mix of DSA question, conceptual discussion on javascript and node.js.

Q1. 
All Paths From Source Lead To Destination Problem Statement
In a directed graph with 'N' nodes numbered from 0 to N-1, determine whether every possible path starting from a given source node (SRC) eventua...read more
Ans. 
Determine if all paths from a given source node lead to a specified destination node in a directed graph.
• Check if there is at least one path from source to destination.

• Ensure that nodes with no outgoing edges from source are the destination.

• Verify that the number of paths from source to destination is finite.

• Return True if all paths from source lead to destination, otherwise False.
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Round duration - 30 Minutes
Round difficulty - Medium

Round duration - 60 Minutes
Round difficulty - Medium

It was a hiring manager round which happened in the evening. The interviewer introduced me to the product I was being hired for, asked me a few questions on my experience (both technical and business). I talked on the architecture and design of Single page applications and my then current project. I was also allowed to ask questions and they were addressed.

Q1. Can you explain the architecture of your current project?
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Round duration - 30 Minutes
Round difficulty - Easy

It was in the evening. The interviewer was professional. I was asked about my past experiences, why I was switching and some behavioral questions.